docker: context method

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

src/docker.ts

@@ -38,6 +38,18 @@ export class Docker {
       });
   }
 
+  public static async context(): Promise<string> {
+    return await Exec.getExecOutput(`docker`, ['context', 'show'], {
+      ignoreReturnCode: true,
+      silent: true
+    }).then(res => {
+      if (res.stderr.length > 0 && res.exitCode != 0) {
+        throw new Error(res.stderr);
+      }
+      return res.stdout.trim();
+    });
+  }
+
   public static async printVersion(): Promise<void> {
     await Exec.exec('docker', ['version']);
   }